Search found 634 matches

by paul
Mon Feb 11, 2019 1:43 pm
Forum: Sensors
Topic: Wind Sensor Rev. P
Replies: 3
Views: 452

Re: Wind Sensor Rev. P

The sensor is a thermistor, a resistor that changes with temperature.

In a more high end hot wire anemometer it would indeed by a "hot wire" a very thin (and very fragile) wire that is heated.

Paul Badger
by paul
Wed Jan 23, 2019 1:25 am
Forum: Sensors
Topic: Direction-sensitive wind measurement
Replies: 3
Views: 464

Re: Direction-sensitive wind measurement

Thanks. But is the only bit that measures air flow the loop on the longer stalk?
Correct, the other bits are about ambient temperature correction.

Paul
by paul
Mon Jan 21, 2019 4:16 pm
Forum: Sensors
Topic: Direction-sensitive wind measurement
Replies: 3
Views: 464

Re: Direction-sensitive wind measurement

I assume that temperature measurement components can be out of the main air flow.
Correct, as long as they are in ambient air somewhere.

Paul
by paul
Wed Jan 16, 2019 4:15 pm
Forum: Sensors
Topic: Measuring Mass Airflow with the Wind Sensor?
Replies: 1
Views: 339

Re: Measuring Mass Airflow with the Wind Sensor?

Absolutely. Wind speed times area = volume / time. You'll need to compensate for temp using gas laws, also humidity comes into play depending on how accurate you are planning to be.
by paul
Fri Oct 26, 2018 2:29 pm
Forum: Sensors
Topic: Wind sensor Rev. P - Voltage dropping, Standby, Overheated?
Replies: 2
Views: 1993

Re: Wind sensor Rev. P - Voltage dropping, Standby, Overheated?

ulrich223, Unfortunately we have seen this before. This is a result of component tolerances that are too close to an edge case where the sensor doesn't function. We are in the process of addressing this but in the meantime, email the shop and we'll replace your sensor. What happens is that in some t...
by paul
Tue Oct 09, 2018 9:52 am
Forum: Sensors
Topic: Wind sensor Rev. P schematic questions and 15V opertion
Replies: 8
Views: 1590

Re: Wind sensor Rev. P schematic questions and 15V opertion

I would recommend people therefore to reconnect pin 4 of the Opamp (its Vcc) to the 9V bus,
I believed that is was connected after the regulator - I'll check on this.
by paul
Mon Oct 08, 2018 9:44 am
Forum: Sensors
Topic: Wind sensor Rev. P schematic questions and 15V opertion
Replies: 8
Views: 1590

Re: Wind sensor Rev. P schematic questions and 15V opertion

Can the supply voltage properties be checked and updated? There is a linear regulator after the input. So a higher input voltage won't achieve what you want. There is a voltage divider that could be changed to allow a higher working voltage. We could do this on request for an order of a few pieces....
by paul
Wed Sep 26, 2018 4:52 pm
Forum: Sensors
Topic: Wind sensor Rev. P schematic questions and 15V opertion
Replies: 8
Views: 1590

Re: Wind sensor Rev. P schematic questions and 15V opertion

Theo_NL, You appear to be correct, checking the schematic that the board should handle 15 volts without an issue. Everything else is running off the regulator output. One possible issue is that the regulator will be generating more heat, since it's just a linear regulator. It's far enough away from ...
by paul
Fri Sep 21, 2018 12:09 pm
Forum: Sensors
Topic: Wind Sensor Rev. P out in the open?
Replies: 3
Views: 1720

Re: Wind Sensor Rev. P out in the open?

Henk, You have two options. As stated above you could coat the board with something. We've had good luck with epoxy, just flowing it onto the board, over the components. (but not the thermistors). If you are going to coat the sensors, use something thinner like spray coat of clear polyurethane or si...
by paul
Thu Aug 23, 2018 3:07 pm
Forum: Hardware
Topic: Fluxamasynth V3 library needed updating
Replies: 2
Views: 2654

Re: Fluxamasynth V3 library needed updating

The fluxamasnth library has moved to Moved to https://github.com/fluxly/Fluxamasynth

It has some new functionality as well as programming to support new shields that in production currently.
by paul
Thu Jun 21, 2018 1:34 pm
Forum: Sensors
Topic: Wind sensor (Rev 3) thermister vs ds18b20
Replies: 1
Views: 991

Re: Wind sensor (Rev 3) thermister vs ds18b20

bitbang3r, Since I can easily mount a ds18b20 sensor within an inch or two of the r3 wind sensor, would I get more accurate windspeed measurements if I modified the code to just ignore the windspeed sensor's onboard thermistor output & base the temperature portion of the windspeed calculations on th...
by paul
Thu May 31, 2018 7:16 pm
Forum: Sensors
Topic: Wind Sensor (Rev P) Help
Replies: 3
Views: 2885

Re: Wind Sensor (Rev P) Help

mstrange Here is one formula you can try WS_MPH = (((Volts – ZeroWind_V) / (3.038517 * (Temp_C ^ 0.115157 ))) / 0.087288 ) ^ 3.009364 you will need to use the pow() function for the exponentials here is the link with some more tips https://moderndevice.com/news/calibrating-rev-p-wind-sensor-new-regr...
by paul
Mon Apr 16, 2018 2:57 pm
Forum: Sensors
Topic: Having an issue getting any reading from Rev. P sensor
Replies: 2
Views: 1537

Re: Having an issue getting any reading from Rev. P sensor

ajd888,

Do you have the grounds from the power supply and the Arduino connected together?
by paul
Mon Apr 02, 2018 12:59 pm
Forum: Sensors
Topic: A1324 Hall Effect Sensor
Replies: 4
Views: 2038

Re: A1324 Hall Effect Sensor

The A1324 will work and is dead easy to hook up.
After confirming the pinout (do this twice as I think the datasheet shows the part from the bottom view - always a bad idea IMO), hook up power and ground and run the output into an ADC (analog) pin.

Paul
by paul
Sat Mar 31, 2018 2:00 pm
Forum: Sensors
Topic: A1324 Hall Effect Sensor
Replies: 4
Views: 2038

Re: A1324 Hall Effect Sensor

I'm not sure why it has Arduino crossed out - I'll investigate when I get time. The sensor works best at 5 volts, but will work down to 3.3 volts with reduced accuracy.

All and all a fabulous linear output hall-effect sensor.

Paul
by paul
Sat Mar 17, 2018 9:00 pm
Forum: Sensors
Topic: Wind Sensor Power Source
Replies: 4
Views: 1943

Re: Wind Sensor Power Source

When I moved to an alternate power supply instead of using the Arduino built in power supply I hooked up the neg alternate power suppy source to the Gnd and the pos to the V on the sensor. The other sensor pins went to the Arduino. But I didn't connect the Arduino Gnd to the sensor Gnd. Once I conn...
by paul
Tue Mar 13, 2018 3:51 pm
Forum: Sensors
Topic: Wind Sensor Rev.P usage questions
Replies: 1
Views: 1367

Re: Wind Sensor Rev.P usage questions

Dan I am using a Wind Sensor Rev.P with an Arduino MEGA 2560 R3. I am powering the sensor from 12.4V. I have noticed with the sensor sitting on my desk in a breadboard, oriented vertically, I regularly see speeds around 1.22 mph without any fans operating. With an 80mm DC fan operating, I see around...
by paul
Tue Mar 13, 2018 3:36 pm
Forum: Sensors
Topic: Wind Sensor Rev. P out in the open?
Replies: 3
Views: 1720

Re: Wind Sensor Rev. P out in the open?

Henk, You should obviously cover the electronics package with something waterproof. My guess is that the sensing elements may not last too long though, out in the weather. Water plus electricity equals electrolytic reactions and corrosion. You could try spraying the sensing elements with some kind o...
by paul
Tue Mar 13, 2018 3:32 pm
Forum: Sensors
Topic: Wind Sensor Power Source
Replies: 4
Views: 1943

Re: Wind Sensor Power Source

Which sensor Rev P or Rev C? I suggest a regulated 5 volt (preferred) or 6 volt supply. If the output isn't stable with a regulated 5 volt supply, then the sensor is defective and needs to be replaced. You can use a battery but the current draw ~30 mA is substantial and will kill a battery in known ...
by paul
Sat Feb 17, 2018 7:59 pm
Forum: Sensors
Topic: Operating specs for wind sensor P
Replies: 1
Views: 1275

Re: Operating specs for wind sensor P

The sensor is designed to maintain hot sensor at about 75C above the ambient sensor. In order for it to work, the circuit must have the voltage and current to heat up the sensor to balance the bridge. Current draw will range from 35 mA perhaps up to 120 mA or more in very windy conditions. One issue...